The Ninja project is an attempt to develop an alternative Nagios GUI with the aim of being the most useful Open Source Web front end for Nagios. It improves searching and filtering and scalability. It supports templates and skins for customizing appearance, and supports several databases. You can use the components of Ninja in combination with the CGI scripts of the original Nagios Web GUI or as replacements for them.

The Nagios Phone Number Check plugin verifies whether a number is answered or not. There is no fancy tone checking(yet). It was written for a customer who needed to know if a line was being answered or not.

The Merlin project was initially started to create an easy way to set up distributed Nagios installations, allowing Nagios processes to exchange information directly as an alternative to the standard method using NSCA. It has also been extended with fault tolerance, the ability to store status information in a database, and other features. This allows Merlin to function as a backend for applications such as the Ninja project.

The Business Objects XI Monitoring plug-in is a software package for monitoring the operation and usage of BusinessObjects XI and Crystal Reports servers. It works with the widely used infrastructure management frameworks, Nagios, HP OpenView, and IBM Tivoli. The plugin is able to check scheduled and manual report runs, measure execution times, and evaluate and eliminate errors before business processes are severely impacted.